DOC: Comment changes in PdfReader (#2990) #5743

Job	Run time
pytest on windows	6m 44s
Build & verify package	11s
Check code style issues	32s
pytest on 3.8 (crypto-lib: cryptography)	5m 22s
pytest on 3.9 (crypto-lib: cryptography)	5m 25s
pytest on 3.10 (crypto-lib: cryptography)	5m 34s
pytest on 3.11 (crypto-lib: cryptography)	5m 10s
pytest on 3.12 (crypto-lib: cryptography)	6m 42s
pytest on 3.13 (crypto-lib: cryptography)	6m 20s
pytest on 3.8 (crypto-lib: pycryptodome)	5m 24s
pytest on 3.8 (crypto-lib: none)	5m 26s
Combine & check coverage.	16s
	53m 6s

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